Section 12: Trouble Shooting - MTD YARD-MAN 11B-106C401 Owner's Manual

SECTION 12: TROUBLE SHOOTING GUIDE
Trouble
Engine fails to start
Engine runs erratic
Engine overheats
Occasional skip
(hesitates) at high
speed
Possible Cause(s)
1. Blade control handle disengaged.
2. Spark plug wire disconnected.
3. Throttle control lever not in correct
position.
4. Fuel tank empty, or stale fuel.
5. Blocked fuel line.
6. Faulty spark plug.
7. Engine flooded.
1. Unit running in START position.
2. Spark plug wire loose.
3. Blocked fuel line or stale fuel.
4. Vent in gas cap plugged.
5. Water or dirt in fuel system.
6. Dirty air cleaner.
7. Carburetor out of adjustment.
1. Engine oil level low.
2. Air flow restricted.
3. Carburetor not adjusted properly.
1. Spark plug gap too close.
Corrective Action
1. Engage blade control handle.
2, Connect wire to spark plug.
3. Move throttle lever to FAST or START
position.
4. Fill tank with clean, fresh gasoline.
5. Clean fuel line.
6. Clean, adjust gap or replace.
7. Crank engine with throttle in FAST
position.
1, Move throttle lever to FAST position.
2. Connect and tighten spark plug wire.
3. Clean fuel line; fill tank with clean, fresh
gasoline.
4, Clear vent.
5. Drain fuel tank. Refill with fresh fuel.
6. Clean air cleaner.
7. Adjust carburetor.
1. Fill crankcase with proper oil.
2. Remove blower housing and clean.
3. Adjust carburetor.
1. Adjust gap to .030".
Idles poorly 1. Spark plug fouled, faulty or gap too 1. Reset gap to.030" or replace spark plug.
wide.
2. Carburetor improperly adjusted. 2. Adjust carburetor.
3, Dirty air cleaner. 3. Clean air cleaner.
Excessive vibration 1. Cutting blade loose or unbalanced. 1. Tighten blade and adapter. Balance blade.
2. Replace blade.
2. Bent cutting blade.
Mower will not mulch 1. Engine speed too low. 1. Set throttle between 3/4 and full throttle.
grass 2. Wet grass. 2,
3. Excessively high grass.
,
4. Dull blade.
4.
Uneven cut 1. Wheels not positioned correctly. 1.
2. Dull blade. 2.
Do not mow when grass is wet; wait until
later to cut.
Mow once at a high cutting height, then
mow again at desired height or make a
narrower cutting swath (1/2 width).
Sharpen or replace blade.
Place all four wheels in same height
position.
Sharpen or replace blade.
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